/*
 * Copyright (C) 2020 ActiveJ LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.activej.csp.dsl;

import io.activej.csp.ChannelConsumer;
import io.activej.csp.ChannelSupplier;

public interface ChannelTransformer<I, O> extends
		ChannelSupplierTransformer<I, ChannelSupplier<O>>,
		ChannelConsumerTransformer<O, ChannelConsumer<I>> {

	static <T> ChannelTransformer<T, T> identity() {
		return new ChannelTransformer<T, T>() {
			@Override
			public ChannelConsumer<T> transform(ChannelConsumer<T> consumer) {
				return consumer;
			}

			@Override
			public ChannelSupplier<T> transform(ChannelSupplier<T> supplier) {
				return supplier;
			}
		};
	}
}
